CN110405078B

CN110405078B - Stamping die

Info

Publication number: CN110405078B
Application number: CN201910744286.7A
Authority: CN
Inventors: 邹苏娥
Original assignee: Jiangsu Jinsanli Machinery Manufacture Co ltd
Current assignee: JIANGSU JINSANLI MACHINERY MANUFACTURE Co.,Ltd.
Priority date: 2019-08-13
Filing date: 2019-08-13
Publication date: 2021-02-19
Anticipated expiration: 2039-08-13
Also published as: CN110405078A; CN112620498A; CN112620499A

Abstract

The invention belongs to the technical field of stamping dies, and particularly relates to a stamping die which comprises a base, supporting plates, a cross beam, a hydraulic pump, a hydraulic column, a limiting mechanism and the like, wherein the cross beam is arranged on the base through the two supporting plates; according to the invention, by adjusting the height position of the limiting block in the limiting mechanism, the hydraulic column drives the limiting plate to downwards complete the stamping process of the raw material, the lower die cannot continuously move towards the platform after the stamping is completed because the limiting plate is limited by the limiting block, so that the mutual collision and extrusion between the lower die and the platform caused by the continuous downwards movement of the lower die after the stamping is completed are avoided, and the cost increase caused by the damage of the lower die due to collision is prevented.

Description

Stamping die

Technical Field

The invention belongs to the technical field of stamping dies, and particularly relates to a stamping die.

Background

The hardware commonly used in life is stamped by a hardware stamping die, the efficiency of stamping the required hardware by the hardware stamping die is high, and the produced hardware has standard specification; the hardware stamping die is widely applied to industrial production, parts are produced by the hardware stamping die, the production efficiency is high, the standard batch production can be realized, raw materials are saved, and the utilization rate of the raw materials is improved; meanwhile, the stamping die can realize the characteristic of non-cutting processing. In the stamping process, if the stamping stroke of the die is not limited, the die continues to move towards the platform and is in contact collision extrusion with the platform after the stamping of the raw material is finished, so that the die is damaged or deformed; the production cost of the die used in the production process is high, and the damage of the die inevitably causes unnecessary loss of enterprises; we have therefore proposed a press die which can be used to limit the die press stroke to solve the above problems.

The invention designs a stamping die to solve the problems.

Disclosure of Invention

In order to solve the defects in the prior art, the invention discloses a stamping die which is realized by adopting the following technical scheme.

In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention conventionally use, which are merely for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, or be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

A stamping die is characterized in that: the device comprises a base, supporting plates, a cross beam, a hydraulic pump, a hydraulic column, a die holder, a lower die, a platform, a limiting plate and a limiting mechanism, wherein the cross beam is arranged on the base through the two supporting plates; a hydraulic pump is arranged on the lower end face of the cross beam, and a hydraulic column is arranged below the hydraulic pump; the lower end of the hydraulic column is provided with a die holder, a lower die is arranged below the die holder, and the lower die is matched with a platform arranged on the base; and the limiting plate synchronous with the extension and retraction of the hydraulic column is matched with a limiting mechanism arranged on the supporting plate.

The limiting mechanism comprises a shell, a shaft A, a one-way driving mechanism, a friction wheel, a shaft B, a limiting block, a friction plate, a sliding block, a spring A, a centrifugal mechanism, a shaft C, a shaft sleeve and a stepping motor, wherein a vertical shaft A and a vertical shaft B are matched with a bearing in the shell which is arranged on the inner side of the supporting plate; the external thread on the shaft B is in threaded fit with the threaded hole on the limiting block; the limiting block which reciprocates in the vertical direction is matched with the limiting plate; the shaft A is provided with two one-way driving mechanisms connected through a shaft sleeve, and the shaft sleeve is in transmission connection with the shaft B; the sliding block horizontally slides in the shell; an arc-shaped friction plate arranged at one end of the sliding block is matched with a friction wheel arranged on the shaft A; a spring A for resetting the sliding block is arranged on the sliding block; the slide block is driven by two centrifugal mechanisms symmetrically distributed on two sides of the slide block; the stepping motor is arranged on the inner wall of the shell; the output shaft of the stepping motor is in one-way accelerating transmission connection with the shaft C where each centrifugal mechanism is located, and the one-way transmission directions of the output shaft of the stepping motor to the two shafts C are opposite; the output shaft of the stepping motor is in transmission connection with the shaft A.

The one-way driving mechanism comprises a rotating ring A, a rotating ring B, a clamping block B, a fixed ring B, a clamping block A and a volute spiral spring, wherein the rotating ring A with the end surface connected with one end of the shaft sleeve rotates on the shaft A; the rotating ring B rotating on the shaft A is embedded into the ring groove B on the inner wall of the shaft hole of the rotating ring A; a fixed ring B arranged on the shaft A is embedded into a ring groove C on the inner wall of the shaft hole of the rotating ring B; the clamping block A arranged on the outer cylindrical surface of the fixing ring B is matched with the clamping block B arranged on the inner wall of the annular groove C; the outer cylindrical surface of the rotating ring B is nested with a volute spiral spring for resetting the rotating ring B.

The centrifugal mechanism comprises a gear G, a fixing ring A, a centrifugal block and a spring B, wherein an annular groove A is circumferentially formed on the inner wall of a shaft hole of the gear G which rotates on a corresponding shaft C, and a plurality of driving grooves are circumferentially and uniformly distributed on the cylindrical surface of the annular groove A; the fixing rings A are arranged on the corresponding shafts C and are embedded into the ring grooves A; a plurality of centrifugal grooves are uniformly distributed on the circumferential direction of the outer cylindrical surface of the fixing ring A, and a centrifugal block matched with the driving groove slides in each centrifugal groove in the radial direction; and a spring B for resetting the corresponding centrifugal block is arranged in each centrifugal groove.

The gears G in the two centrifugal mechanisms are respectively matched with two toothed plates symmetrically arranged on two sides of the sliding block, and the rotating directions of two volute spiral springs in the two one-way driving mechanisms are opposite.

As a further improvement of the technology, the limiting plate is arranged on the hydraulic column through a connecting block fixedly connected with the center of the side surface of the limiting plate; the inner side surfaces of the two supporting plates are symmetrically provided with two guide grooves A, and two ends of the limiting plate vertically slide in the two guide grooves A respectively; the die holder is connected with the lower die through four fastening bolts which are uniformly distributed in the circumferential direction. The guide groove A provides a track for the movement of the limiting plate, and indirectly ensures that the hydraulic column drives the die to stably move up and down.

As a further improvement of the technology, the limiting block is U-shaped, and two branches of the limiting block vertically slide in two guide grooves B on the side face of the shell respectively. The guide way B provides a track for the vertical motion of the limiting block, and two branches of the U-shaped limiting block extend out of the guide way B to be matched with the limiting plate.

As a further improvement of the technology, the shaft sleeve is provided with a gear D, and a shaft B is provided with a gear F; the top in the shell is provided with a gear E through a shaft, and the gear E is meshed with a gear D and a gear F simultaneously.

As a further improvement of the present technique, the shaft C is parallel to the output shaft of the stepping motor; a fixed seat is arranged on the inner wall of the shell and is positioned between the sliding block and the stepping motor; a gear A is installed on an output shaft of the stepping motor, a gear B is installed on the fixed seat through a shaft, and a gear C is installed on the shaft A; gear B meshes with gear a and gear C simultaneously.

As a further improvement of the technology, the axes C of the two centrifugal mechanisms are respectively matched with the bearings of the fixed seat; the two shafts C are respectively provided with a one-way ring, and the one-way driving directions of the two one-way rings are opposite; and a gear H is arranged on the outer ring of each one-way ring, and the two gears H are simultaneously meshed with the gear A.

As a further improvement of the technology, the lower surface of the sliding block is provided with a trapezoidal guide block which slides in a trapezoidal guide groove on the upper surface of the fixed seat. The matching of the trapezoidal guide block and the trapezoidal guide groove plays a role in positioning and guiding the sliding of the sliding block along the upper surface of the fixed seat.

As a further improvement of the technology, one end of the spiral spring is connected with the outer cylindrical surface of the corresponding rotating ring B, and the other end of the spiral spring is connected with the inner wall of the corresponding ring groove B.

As a further improvement of the present technology, the spring a is a compression spring; one end of the spring A is connected with the end face of the sliding block, and the other end of the spring A is connected with the inner wall of the shell; the spring B is an extension spring; one end of the spring B is connected with the inner wall of the corresponding centrifugal groove, and the other end of the spring B is connected with the corresponding centrifugal block.

As a further improvement of the technology, the transmission ratio of the gear a to the gear H is less than 1, so that after the output shaft of the stepping motor is transmitted by the gear a and the gear H, the output shaft drives the shaft C on which the one-way ring exerting the one-way driving function is located to rotate at a high speed, the shaft C drives the fixing ring a in the centrifugal mechanism thereon to rotate at a high speed, and the fixing ring a rotating at a high speed generates enough centrifugal force, so that a plurality of centrifugal blocks in the fixing ring a rapidly slide out of the corresponding centrifugal grooves and enter the driving grooves in the corresponding gears G, thereby completing the transmission connection between the fixing ring a and the corresponding gears G in the centrifugal mechanism; the transmission ratio of the gear A to the gear F is smaller than 1, so that the output shaft of the stepping motor is ensured to drive the shaft B to rotate at a high speed through the gear A, the gear B, the gear C, the shaft A, the gear D, the gear E and the gear F, and the shaft B rotating at a high speed drives the limiting block in threaded fit with the shaft B to rapidly move vertically along the guide groove B, so that the height position of the limiting block can be rapidly adjusted.

Compared with the traditional stamping die, the height position of the limiting block in the limiting mechanism is adjusted, so that the hydraulic column drives the limiting plate to downwards complete the stamping process of the raw material, the lower die cannot continuously move towards the platform after the stamping is completed because the limiting plate is limited by the limiting block, the mutual collision and extrusion between the lower die and the platform caused by the continuous downwards movement after the lower die completes the stamping are avoided, and the cost increase caused by the damage of the lower die due to the collision is prevented; compared with a guiding mechanism of a hardware stamping die with the patent number of CN 107745045, the guiding mechanism of the hardware stamping die adopts a driving motor and a stepping motor as driving, the same effect can be realized by only adopting one stepping motor in the invention, and the operation is simple and convenient; compared with the effect of protecting the lower die by adopting the driving motor and the stepping motor, the invention has only one stepping motor, thereby reducing the production cost of the equipment to a certain extent. In addition, the invention has simpler structure and higher practicability under the condition that only one stepping motor is used for driving; the invention has simple structure and better use effect.

Drawings

Figure 1 is a schematic cross-sectional view of the apparatus as a whole.

Fig. 2 is a schematic sectional view of the stopper mechanism.

Fig. 3 is a partial sectional schematic view of the spacing mechanism.

FIG. 4 is a schematic view of the section of the shaft B, the limiting block and the housing.

FIG. 5 is a cross-sectional view of the single direction driving mechanism and the shaft A.

Fig. 6 is a schematic cross-sectional view of the shaft a, the shaft sleeve, the friction wheel, the friction plate, the sliding block, the toothed plate and the centrifugal mechanism.

Fig. 7 is a schematic cross-sectional view of the slider, the toothed plate, the centrifugal mechanism, the fixing base, the one-way ring, the gear H, the gear a, and the stepping motor.

FIG. 8 is a cross-sectional view of the shaft A, gear C, gear B, gear A, gear H, one-way ring and shaft C.

Fig. 9 is a schematic perspective view of the housing.

FIG. 10 is a schematic view of a centrifuge mechanism and its cross-section.

FIG. 11 is a schematic partial cross-sectional view of a centrifuge mechanism.

Fig. 12 is a cross-sectional view of the gear G and the fixing ring a.

Fig. 13 is a schematic cross-sectional view of a one-way drive mechanism engaged with a bushing.

Fig. 14 is a schematic sectional view of the rotating ring a.

FIG. 15 is a schematic sectional view of the engagement of the rotating ring B with the cartridge B.

Fig. 16 is a perspective schematic view of a holder.

Number designation in the figures: 1. a base; 2. a support plate; 3. a guide groove A; 4. a cross beam; 5. a hydraulic pump; 6. a hydraulic column; 7. a die holder; 8. a lower die; 9. fastening a bolt; 10. a platform; 11. connecting blocks; 12. a limiting plate; 13. a limiting mechanism; 14. a housing; 15. a guide groove B; 16. an axis A; 17. a gear C; 18. a one-way drive mechanism; 19. a friction wheel; 20. a gear D; 21. a gear E; 22. a gear F; 23. a shaft B; 24. a limiting block; 25. a friction plate; 26. a slider; 27. a trapezoidal guide block; 28. a toothed plate; 29. a spring A; 30. a fixed seat; 31. a trapezoidal guide groove; 32. a centrifugal mechanism; 33. a gear G; 34. a ring groove A; 35. a drive slot; 36. a fixing ring A; 37. a centrifugal tank; 38. a centrifugal block; 39. a spring B; 40. an axis C; 41. a shaft sleeve; 42. a stepping motor; 43. a gear B; 44. a unidirectional ring; 45. a gear H; 46. a gear A; 47. rotating the ring A; 48. a ring groove B; 49. a rotating ring B; 50. a ring groove C; 51. a clamping block B; 52. a fixing ring B; 53. a clamping block A; 54. a spiral spring.

Detailed Description

The drawings are schematic illustrations of the implementation of the present invention to facilitate understanding of the principles of structural operation. The specific product structure and the proportional size are determined according to the use environment and the conventional technology.

As shown in fig. 1, 2 and 3, the device comprises a base 1, support plates 2, a cross beam 4, a hydraulic pump 5, a hydraulic column 6, a die holder 7, a lower die 8, a platform 10, a limit plate 12 and a limit mechanism 13, wherein the cross beam 4 is installed on the base 1 through the two support plates 2 as shown in fig. 1; a hydraulic pump 5 is arranged on the lower end face of the cross beam 4, and a hydraulic column 6 is arranged below the hydraulic pump 5; a die holder 7 is arranged at the lower end of the hydraulic column 6, a lower die 8 is arranged below the die holder 7, and the lower die 8 is matched with a platform 10 arranged on the base 1; a limit plate 12 synchronized with the extension and retraction of the hydraulic column 6 is fitted with a limit mechanism 13 mounted on the support plate 2.

As shown in fig. 2, 3 and 7, the limiting mechanism 13 includes a housing 14, a shaft a16, a one-way driving mechanism 18, a friction wheel 19, a shaft B23, a limiting block 24, a friction plate 25, a slider 26, a spring a29, a centrifugal mechanism 32, a shaft C40, a shaft sleeve 41 and a stepping motor 42, wherein as shown in fig. 2, a vertical shaft a16 and a vertical shaft B23 are matched with bearings in the housing 14 mounted on the inner side of the support plate 2; as shown in fig. 2 and 4, the external thread on the shaft B23 is in threaded fit with the threaded hole on the stopper 24; the limiting block 24 which reciprocates in the vertical direction is matched with the limiting plate 12; as shown in fig. 3, two unidirectional driving mechanisms 18 connected through a shaft sleeve 41 are mounted on the shaft a16, and the shaft sleeve 41 is in transmission connection with the shaft B23; as shown in fig. 2 and 3, the slider 26 slides horizontally in the housing 14; as shown in fig. 3 and 6, an arc-shaped friction plate 25 mounted at one end of a slider 26 is engaged with a friction wheel 19 mounted on a shaft a 16; a spring A29 for resetting the slide block 26 is arranged on the slide block; the slide 26 is driven by two centrifugal mechanisms 32 symmetrically distributed on both sides thereof; as shown in fig. 3 and 4, the stepping motor 42 is mounted on the inner wall of the housing 14; as shown in fig. 7, the output shaft of the stepping motor 42 is in one-way acceleration transmission connection with the shaft C40 on which each centrifugal mechanism 32 is located, and the one-way transmission directions of the output shaft of the stepping motor 42 to the two shafts C40 are opposite; as shown in FIG. 3, the output shaft of the stepper motor 42 is drivingly connected to the shaft A16.

As shown in fig. 13, the one-way driving mechanism 18 includes a rotating ring a47, a rotating ring B49, a latch B51, a fixed ring B52, a latch a53, and a spiral spring 54, wherein as shown in fig. 3 and 13, a rotating ring a47 whose end face is connected with one end of the shaft sleeve 41 rotates on a shaft a 16; as shown in fig. 3 and 14, rotating ring B49 rotating on shaft a16 is fitted into ring groove B48 on the inner wall of the shaft hole of rotating ring a 47; as shown in fig. 3 and 15, a fixed ring B52 mounted on a shaft a16 is fitted into a ring groove C50 on the inner wall of the shaft hole of the rotating ring B49; as shown in fig. 5 and 15, the latch a53 mounted on the outer cylindrical surface of the fixing ring B52 is matched with the latch B51 mounted on the inner wall of the ring groove C50; as shown in fig. 5 and 13, the outer cylindrical surface of the rotating ring B49 is nested with a wrap spring 54 for restoring the rotating ring B.

As shown in fig. 10 and 11, the centrifugal mechanism 32 includes a gear G33, a fixing ring a36, a centrifugal block 38, and a spring B39, wherein as shown in fig. 7 and 12, a circumferential groove a34 is formed on an inner wall of a shaft hole of the gear G33 rotating on a corresponding shaft C40, and a plurality of driving grooves 35 are uniformly distributed on a cylindrical surface of the circumferential groove a34 in the circumferential direction; as shown in fig. 7, 10 and 12, the fixing rings a36 are mounted on the respective shafts C40 and are inserted into the ring grooves a 34; as shown in fig. 11 and 12, a plurality of centrifugal grooves 37 are uniformly distributed on the outer cylindrical surface of the fixing ring a36 in the circumferential direction, and a centrifugal block 38 matched with the driving groove 35 is radially slid in each centrifugal groove 37; each centrifugal groove 37 is provided with a spring B39 for restoring the corresponding centrifugal block 38.

As shown in fig. 6, the gears G33 of the two centrifugal mechanisms 32 are respectively engaged with two toothed plates 28 symmetrically installed on both sides of the sliding block 26; as shown in fig. 5, the two wrap springs 54 of the two unidirectional drives 18 have opposite rotational directions.

As shown in fig. 1, the limiting plate 12 is mounted on the hydraulic column 6 through a connecting block 11 fixedly connected to the center of the side surface thereof; as shown in fig. 1, two guide grooves A3 are symmetrically formed on the inner side surfaces of the two support plates 2, and two ends of the position limiting plate 12 vertically slide in the two guide grooves A3 respectively; the die holder 7 is connected with the lower die 8 through four fastening bolts 9 which are uniformly distributed in the circumferential direction. The guide groove A3 provides a track for the motion of the limiting plate 12, and indirectly ensures that the hydraulic column 6 drives the mould to move up and down stably.

As shown in fig. 4 and 9, the stopper 24 is U-shaped, and two legs thereof vertically slide in two guide grooves B15 on the side surface of the housing 14. The guide groove B15 provides a track for the vertical movement of the limiting block 24, and meanwhile, two extending guide grooves B15 of the U-shaped limiting block 24 are matched with the limiting plate 12.

As shown in fig. 2 and 3, the sleeve 41 is provided with a gear D20, and the shaft B23 is provided with a gear F22; a gear E21 is mounted on the top of the housing 14 through a shaft, and a gear E21 is meshed with a gear D20 and a gear F22 simultaneously.

As shown in fig. 7, the shaft C40 is parallel to the output shaft of the stepping motor 42; a fixed seat 30 is arranged on the inner wall of the shell 14, and the fixed seat 30 is positioned between the slide block 26 and the stepping motor 42; as shown in fig. 3 and 8, a gear a46 is mounted on the output shaft of the stepping motor 42, a gear B43 is mounted on the fixed seat 30 through a shaft, and a gear C17 is mounted on the shaft a 16; gear B43 meshes with both gear a46 and gear C17.

As shown in fig. 7 and 16, the axes C40 of the two centrifugal mechanisms 32 are respectively in bearing fit with the fixing base 30; as shown in fig. 7 and 8, the two shafts C40 are respectively provided with one-way rings 44, and the one-way driving directions of the two one-way rings 44 are opposite; the outer ring of each one-way ring 44 is mounted with a gear H45, and both gears H45 are simultaneously meshed with gear a 46.

As shown in fig. 3, 7 and 16, a trapezoidal guide block 27 is mounted on the lower surface of the slider 26, and the trapezoidal guide block 27 slides in a trapezoidal guide groove 31 on the upper surface of the fixing base 30. The cooperation of the trapezoidal guide block 27 and the trapezoidal guide groove 31 plays a positioning and guiding role in the sliding of the slide block 26 along the upper surface of the fixed seat 30.

As shown in fig. 5, the spiral spring 54 has one end connected to the outer cylindrical surface of the corresponding rotating ring B49 and the other end connected to the inner wall of the corresponding ring groove B48.

As shown in fig. 3, the spring a29 is a compression spring; one end of the spring A29 is connected with the end face of the slide block 26, and the other end is connected with the inner wall of the shell 14; as shown in fig. 11, the spring B39 is an extension spring; one end of the spring B39 is connected with the inner wall of the corresponding centrifugal groove 37, and the other end is connected with the corresponding centrifugal block 38.

As shown in fig. 8, the transmission ratio between the gear a46 and the gear H45 is smaller than 1, so that the output shaft of the stepping motor 42 is driven by the gear a46 and the gear H45 to drive the shaft C40 of the unidirectional ring 44 which performs unidirectional driving to rotate at a high speed, the shaft C40 drives the fixing ring a36 in the centrifugal mechanism 32 thereon to rotate at a high speed, and the fixing ring a36 which rotates at a high speed generates sufficient centrifugal force, so that the centrifugal blocks 38 in the fixing ring a36 slide out of the corresponding centrifugal grooves 37 and enter the driving grooves 35 in the corresponding gears G33, thereby completing the transmission connection between the fixing ring a36 and the corresponding gear G33 in the centrifugal mechanism 32; as shown in fig. 3, the transmission ratio of the gear a46 to the gear F22 is smaller than 1, so that it is ensured that the output shaft of the stepping motor 42 drives the shaft B23 to rotate at a high speed through the gear a46, the gear B43, the gear C17, the shaft a16, the gear D20, the gear E21 and the gear F22, and the shaft B23 rotating at a high speed drives the stopper 24 in threaded engagement with the shaft to rapidly move vertically along the guide groove B15, so as to rapidly complete the adjustment of the height position of the stopper 24.

According to the invention, under the matching action of the friction plate 25 and the friction wheel 19, after the height of the limiting block 24 is adjusted, the friction plate 25 is in friction fit with the friction wheel 19, and the rotation of the shaft A16 is limited; the gear D20 cannot rotate under the action of external force, the gear D20 cannot drive the gear F22 to rotate through the gear E21 under the action of external force, the gear F22 cannot drive the shaft B23 to rotate, and the shaft B23 cannot drive the limiting block 24 in threaded fit with the shaft B to move in the vertical direction; so that the position of the adjusted stopper 24 is fixed.

The one-way ring 44 of the present invention may be implemented by a conventional annular one-way clutch.

In the invention, when the stepping motor 42 drives the limit block 24 to vertically reach a position which is a fixed distance away from a target position through a series of transmission, the control system controls the stepping motor 42 to stop running, and after the stepping motor 42 stops running, the energy of the volute spiral spring 54 in the one-way driving mechanism 18 which previously plays a driving role is released; the energy-releasing volute spring 54 simultaneously drives the rotating ring A47 in the corresponding one-way driving mechanism 18 to continue rotating, the rotating ring A47 drives the gear D20 to continue rotating in the same direction through the shaft sleeve 41, the gear D20 drives the shaft B23 to continue rotating through the gear E21 and the gear F22, and the rotating shaft B23 drives the limiting block 24 in threaded fit with the rotating shaft B to continue moving to the target position to be debugged; meanwhile, the scroll spring 54 releasing energy drives the shaft a16 to rotate reversely through the rotating ring B49, the latch B51, the latch a53 and the fixing ring B52; the dog a53 in the one-way driving mechanism 18, which has not been driven previously, approaches toward the corresponding dog B51; when the stop block 24 reaches the target position under the driving of the energy-releasing spiral spring 54, the energy-releasing spiral spring 54 returns to the initial state, and the latch a53 in the unidirectional driving mechanism 18, which has not previously performed the driving function, comes into contact with the latch B51 again; the position of the limit block 24 just reaches the target position from the position where the stepping motor 42 stops operating, the stroke of the limit block 24 when the position of the stop operating of the stepping motor 42 reaches the target position serves as an advance, the stepping motor 42 stops operating when the limit block 24 reaches the advance position every time the height of the limit block 24 is adjusted, and the limit block 24 automatically finishes the advance stroke and reaches the target position in the resetting process inside the limit mechanism 13 and finishes adjusting the height of the limit block 24. Because the limiting block 24 is in threaded fit with the shaft B23, and the threaded fit has a self-locking function, the limiting block 24 is positioned at the target position and is not easy to displace; in order to avoid the rotation of the gear D20 under the action of external force, the rotating gear D20 drives the limiting block 24 to move through the gear E21, the gear F22 and the shaft B23; after the stepping motor 42 stops operating, when the interior of the limiting mechanism 13 is reset quickly, the friction plate 25 and the friction wheel 19 are contacted again and limit the rotation of the gear D20, so that the position of the limiting block 24 is further fixed, and the movement stroke of the lower die 8 for punching is effectively limited. The specific numerical value of the advance before the limiting block 24 reaches the target position is obtained through a large number of tests.

The stepping motor 42 in the invention adopts the prior art, and the stepping motor 42 is electrically connected with a control system; the stepping motor 42 has a braking torque, so that the resetting process of the volute spiral spring 54 in the one-way driving mechanism 18 is relatively slow under the limitation of the braking torque of the stepping motor 42, the reverse rotation of the stepping motor 42 drives the rotation speed of the centrifugal mechanism 32 to be slow, the centrifugal block 38 in the centrifugal mechanism 32 cannot slide into the driving groove 35 in the gear G33, and the transmission of the rotating ring a47 and the gear G33 is released; under the reset action of the spring A29, the slide block 26 is reset rapidly, the friction plate 25 and the friction wheel 19 form friction fit and stop the rotation of the shaft sleeve 41, so that the continuous rotation of the rotating ring A47 in the two one-way driving mechanisms 18 is prevented, and at the moment, the limiting block 24 finishes advancing and reaches a target position; shaft a16 continues to rotate backward under the restoring action of scroll spring 54 in the previously-actuated one-way drive mechanism 18 until the release of scroll spring 54 is completed, and latch a53 in the previously-actuated one-way drive mechanism 18 makes contact with latch B51 again.

In the one-way driving mechanism 18 of the present invention, the latch a53 rotates less than one turn relative to the latch B51, and the deformation of the spiral spring 54 therein is enough to drive the stopper 24 to move through a series of transmissions.

The working process of the invention is as follows: in the initial state, the latch a53 of the two unidirectional driving mechanisms 18 respectively contact with the corresponding latch B51; the arc-shaped friction plate 25 is in complete contact with and friction fit with the friction wheel 19; the gears G33 in the two centrifugal mechanisms 32 are respectively engaged with two toothed plates 28 mounted on both sides of the slide block 26; spring a29 is compressed.

After the lower die 8 in the invention is replaced, the specification of the lower die 8 changes, and compared with a stamped plate with the same specification, the effective stamping stroke of the replaced lower die 8 for completing single stamping changes, in order to avoid the damage of the lower die 8 caused by the mutual extrusion between the lower die 8 and the platform 10 due to the fact that the actual stroke of the hydraulic pump 5 for driving the lower die 8 to move downwards through the hydraulic column 6 and the die holder 7 is larger than the stamping stroke, the height position of the limiting block 24 in the limiting mechanism 13 needs to be adjusted up and down, the stroke of the hydraulic column 6 is limited through the limiting plate 12, the stroke of the hydraulic column 6 for driving the lower die 8 to move downwards through the die holder 7 is controlled within the reasonable range corresponding to the lower die 8, and the hydraulic column 6 for driving the lower die 8 through the die holder 7 just completes stamping of the plate and then stops moving downwards continuously; the adjustment process of the limiting block 24 in the limiting mechanism 13 is as follows:

the stepping motor 42 is controlled by the control system to operate, and because the transmission ratio of the gear A46 to the gear H45 is less than 1, the stepping motor 42 drives the two gears H45 to rotate at high speed in the same direction through the gear A46; at the moment, one unidirectional ring 44 plays a unidirectional driving role, and the other unidirectional ring 44 generates overrunning, so that the unidirectional ring 44 with the unidirectional driving role drives the corresponding shaft C40 to synchronously rotate at high speed, and the overrunning unidirectional ring 44 cannot drive the corresponding shaft C40 to rotate; the high-speed rotating shaft C40 drives the fixing ring A36 in the centrifugal mechanism 32 thereon to synchronously rotate at high speed; under the action of centrifugal force, a plurality of centrifugal blocks 38 in the fixing ring A36 rotating at high speed respectively and simultaneously enter the driving grooves 35 in the corresponding gear G33 along the corresponding centrifugal grooves 37, and transmission connection is instantly established between the fixing ring A36 and the corresponding gear G33. A plurality of springs B39 corresponding to a plurality of centrifugal blocks 38 are stretched and store energy; the fixed ring A36 rotating at high speed drives the corresponding gear G33 to synchronously rotate at high speed through a plurality of centrifugal blocks 38; the fixed ring A36 in the centrifugal mechanism 32 on the non-rotating shaft C40 does not rotate, a plurality of centrifugal blocks 38 in the fixed ring A36 are positioned in the corresponding centrifugal grooves 37, and no transmission connection is established between the fixed ring A36 and the gear G33; the gear G33 on the rotating shaft C40 drives the sliding block 26 to slide along the trapezoidal guide groove 31 through the corresponding toothed plate 28, the spring A29 is compressed and stores energy, the friction plate 25 is quickly separated from the friction wheel 19, and the limitation on the friction wheel 19 is released; the moving slide block 26 drives the gear G33 on the non-rotating shaft C40 to rotate; when the gear G33 on the rotating shaft C40 and the driving slide block 26 slide to the extreme position, the gear G33 continuously stirs the end teeth on the corresponding tooth plate 28, so that the slide block 26 is kept in the extreme position and is kept basically still, and it is ensured that the friction plate 25 and the friction wheel 19 do not interact during the adjustment of the limit block 24.

Meanwhile, the gear a46 drives the fixed rings B52 in the two unidirectional driving mechanisms 18 to synchronously rotate through the gear B43, the gear C17 and the shaft a16, the fixture block a53 on one fixed ring B52 is separated from the corresponding fixture block B51, and the fixture block a53 on the other fixed ring B52 drives the corresponding rotating ring B49 to synchronously rotate through the fixture block B51; under the action of external load, the rotating ring B49 rotating synchronously with the shaft A16 drives the corresponding scroll spring 54 to deform and store energy; when the deformation amount of the deformed spiral spring 54 reaches a certain degree, the elastic force generated by the deformation of the spiral spring 54 is enough to drive the corresponding rotating ring A47 to rotate synchronously; at this time, the one-way drive mechanism 18 in which the deformed spiral spring 54 is located functions as a drive, and the other one-way drive mechanism 18 does not function as a drive; the rotating ring A47 in the one-way driving mechanism 18 with the driving function drives the rotating ring A47 in the other one-way driving mechanism 18 to synchronously rotate through the shaft sleeve 41, the rotating ring A47 drives the corresponding rotating ring B49 to synchronously rotate through the corresponding volute spiral spring 54, and the fixture block B51 follows the fixture block A53 to synchronously rotate; the latch A53 and the latch B51 in the unidirectional driving mechanism 18 which does not have the driving function do not move relatively any more and keep a certain distance to rotate synchronously; meanwhile, the rotating sleeve 41 drives the shaft B23 to rotate through the gear D20, the gear E21 and the gear F22, and the shaft B23 drives the limiting block 24 in threaded fit with the shaft B23 to vertically move upwards or downwards along the guide groove B15.

When the distance between the limiting block 24 and the target position is an advance, the control system controls the stepping motor 42 to stop running, the centrifugal block 38 in the centrifugal mechanism 32 playing a driving role is quickly reset under the reset action of the corresponding spring B39, and the transmission connection between the gear G33 and the fixing ring A36 is cut off; at this time, the rotating ring a47 in the unidirectional drive mechanism 18 that has previously performed the driving action continues to rotate by the return action of the deformed wrap spring 54, and the shaft a16 is reversed; since the stepping motor 42 has a braking torque, the shaft a16 drives the output shaft of the stepping motor 42 to slowly rotate reversely through the gear C17, the gear B43 and the gear a46 against the braking torque of the stepping motor 42; the latch a53 and the latch B51 in the one-way driving mechanism 18 which previously exerts the driving action are always kept in contact, and the latch a53 and the latch B51 in the one-way driving mechanism 18 which previously does not exert the driving action are quickly close to each other; the rotating ring A47 which continues to rotate drives the gear D20 to rotate continuously through the shaft sleeve 41; the gear D20 drives the limiting block 24 to continue to move to the target position through the gear E21, the gear F22 and the shaft B23; when the stop block 24 moves to the target position, the energy release of the spiral spring 54 is finished and the initial state is recovered, the latch a53 in the one-way driving mechanism 18 which does not exert the driving function before contacts with the latch B51 again, the rotating ring a47 in the two one-way driving mechanisms 18 stops rotating, and the shaft a16 stops rotating; at this time, under the reset action of the spring a29, the slide block 26 is just reset, and the friction plate 25 is pressed again in contact with the friction wheel 19.

In the process of resetting the sliding block 26, the sliding block 26 drives the two gears G33 to rotate reversely through the two toothed plates 28; the fixed rings A36 in the two centrifugal mechanisms 32 do not form transmission with the corresponding gear G33; in the process of slow reverse rotation of the stepping motor 42, the stepping motor 42 drives the two gears H45 to slowly reverse through the gear A46, the one-way ring 44 which previously plays a role of one-way driving becomes overrunning, and the one-way ring 44 which previously plays a role of overrunning becomes one-way driving; the unidirectional ring 44 driven in the unidirectional mode drives the corresponding shaft C40 and the fixing ring a36 on the shaft C40 to synchronously and slowly rotate, the centrifugal force generated by the rotation of the unidirectional ring is not enough to drive the centrifugal block 38 in the corresponding fixing ring a36 to slide into the driving groove 35 in the corresponding gear G33, at this time, the gear G33 in the centrifugal mechanism 32 coaxial with the unidirectional ring 44 which exerts the unidirectional drive and the corresponding fixing ring a36 are not in transmission connection, the reverse rotation shaft C40 of the gear G33 does not interfere, and further the reverse rotation of the stepping motor 42 does not interfere.

After the position of the limiting block 24 is adjusted, the control system controls the hydraulic pump 5 to operate, the hydraulic pump 5 drives the hydraulic column 6 to extend, and the hydraulic column 6 drives the lower die 8 to move towards the stamping material on the platform 10 through the die holder 7 and complete stamping; when the limiting plate 12 moves downwards along with the hydraulic column 6 and meets the limiting block 24 with the adjusted height, the lower die 8 just finishes stamping the stamping material, the limiting block 24 limits the telescopic column through the limiting plate 12 to drive the lower die 8 to continue moving downwards through the die holder 7, and the lower die 8 is prevented from colliding and extruding with the platform 10 to be damaged.

In the process of establishing transmission connection between the fixed ring A36 rotating at high speed in the centrifugal mechanism 32 and the gear G33, if the centrifugal blocks 38 in the centrifugal groove 37 on the fixed ring A36 are not opposite to the driving grooves 35 in the gear G33 one by one, one end of each centrifugal block 38 is in contact with the cylindrical surface of the annular groove A34 in the gear G33; as the fixing ring A36 drives the centrifugal blocks 38 to rotate at a high speed, the centrifugal blocks 38 will be opposite to the corresponding driving grooves 35, and enter the corresponding driving grooves 35 under the action of centrifugal force to complete the transmission connection between the fixing ring A36 and the corresponding gear G33.

In conclusion, the invention has the beneficial effects that: according to the invention, by adjusting the height position of the limit block 24 in the limit mechanism 13, the hydraulic column 6 drives the limit plate 12 to downwards complete the stamping process of raw materials, the lower die 8 cannot continuously move towards the platform 10 after the stamping is completed because the limit plate 12 is limited by the limit block 24, so that the mutual collision and extrusion between the lower die 8 and the platform 10 caused by the continuous downwards movement after the stamping of the lower die 8 is completed are avoided, and the cost increase caused by the damage of the lower die 8 due to the collision is prevented; compared with a guiding mechanism of a hardware stamping die with the patent number of CN 107745045, the guiding mechanism of the hardware stamping die adopts a driving motor and a stepping motor 42 as driving, the same effect can be realized by only adopting one stepping motor 42, and the operation is simple and convenient; compared with the effect of protecting the lower die 8 by adopting the driving motor and the stepping motor 42, the invention only has one stepping motor 42, thereby reducing the production cost of the equipment to a certain extent. In addition, the present invention has a simple structure and high practicability when only one stepping motor 42 is used for driving.

Claims

1. A stamping die is characterized in that: the device comprises a base, supporting plates, a cross beam, a hydraulic pump, a hydraulic column, a die holder, a lower die, a platform, a limiting plate and a limiting mechanism, wherein the cross beam is arranged on the base through the two supporting plates; a hydraulic pump is arranged on the lower end face of the cross beam, and a hydraulic column is arranged below the hydraulic pump; the lower end of the hydraulic column is provided with a die holder, a lower die is arranged below the die holder, and the lower die is matched with a platform arranged on the base; the limiting plate synchronous with the expansion and contraction of the hydraulic column is matched with a limiting mechanism arranged on the supporting plate;

the limiting mechanism comprises a shell, a shaft A, a one-way driving mechanism, a friction wheel, a shaft B, a limiting block, a friction plate, a sliding block, a spring A, a centrifugal mechanism, a shaft C, a shaft sleeve and a stepping motor, wherein a vertical shaft A and a vertical shaft B are matched with a bearing in the shell which is arranged on the inner side of the supporting plate; the external thread on the shaft B is in threaded fit with the threaded hole on the limiting block; the limiting block which reciprocates in the vertical direction is matched with the limiting plate; the shaft A is provided with two one-way driving mechanisms connected through a shaft sleeve, and the shaft sleeve is in transmission connection with the shaft B; the sliding block horizontally slides in the shell; an arc-shaped friction plate arranged at one end of the sliding block is matched with a friction wheel arranged on the shaft A; a spring A for resetting the sliding block is arranged on the sliding block; the slide block is driven by two centrifugal mechanisms symmetrically distributed on two sides of the slide block; the stepping motor is arranged on the inner wall of the shell; the output shaft of the stepping motor is in one-way accelerating transmission connection with the shaft C where each centrifugal mechanism is located, and the one-way transmission directions of the output shaft of the stepping motor to the two shafts C are opposite; the output shaft of the stepping motor is in transmission connection with the shaft A;

the one-way driving mechanism comprises a rotating ring A, a rotating ring B, a clamping block B, a fixed ring B, a clamping block A and a volute spiral spring, wherein the rotating ring A with the end surface connected with one end of the shaft sleeve rotates on the shaft A; the rotating ring B rotating on the shaft A is embedded into the ring groove B on the inner wall of the shaft hole of the rotating ring A; a fixed ring B arranged on the shaft A is embedded into a ring groove C on the inner wall of the shaft hole of the rotating ring B; the clamping block A arranged on the outer cylindrical surface of the fixing ring B is matched with the clamping block B arranged on the inner wall of the annular groove C; the outer cylindrical surface of the rotating ring B is nested with a volute spiral spring for resetting the rotating ring B;

the centrifugal mechanism comprises a gear G, a fixing ring A, a centrifugal block and a spring B, wherein an annular groove A is circumferentially formed on the inner wall of a shaft hole of the gear G which rotates on a corresponding shaft C, and a plurality of driving grooves are circumferentially and uniformly distributed on the cylindrical surface of the annular groove A; the fixing rings A are arranged on the corresponding shafts C and are embedded into the ring grooves A; a plurality of centrifugal grooves are uniformly distributed on the circumferential direction of the outer cylindrical surface of the fixing ring A, and a centrifugal block matched with the driving groove slides in each centrifugal groove in the radial direction; a spring B for resetting the corresponding centrifugal block is arranged in each centrifugal groove;

2. A stamping die as claimed in claim 1, wherein: the limiting plate is arranged on the hydraulic column through a connecting block fixedly connected with the center of the side face of the limiting plate; the inner side surfaces of the two supporting plates are symmetrically provided with two guide grooves A, and two ends of the limiting plate vertically slide in the two guide grooves A respectively; the die holder is connected with the lower die through four fastening bolts which are uniformly distributed in the circumferential direction.

3. A stamping die as claimed in claim 1, wherein: the limiting blocks are U-shaped, and two ends of the limiting blocks vertically slide in two guide grooves B on the side face of the shell respectively.

4. A stamping die as claimed in claim 1, wherein: the shaft sleeve is provided with a gear D, and the shaft B is provided with a gear F; the top in the shell is provided with a gear E through a shaft, and the gear E is meshed with a gear D and a gear F simultaneously.

5. A stamping die as claimed in claim 4, wherein: the shaft C is parallel to the output shaft of the stepping motor; a fixed seat is arranged on the inner wall of the shell and is positioned between the sliding block and the stepping motor; a gear A is installed on an output shaft of the stepping motor, a gear B is installed on the fixed seat through a shaft, and a gear C is installed on the shaft A; gear B meshes with gear a and gear C simultaneously.

6. A stamping die as claimed in claim 5, wherein: the shaft C where the two centrifugal mechanisms are located is respectively matched with a bearing of the fixed seat; the two shafts C are respectively provided with a one-way ring, and the one-way driving directions of the two one-way rings are opposite; and a gear H is arranged on the outer ring of each one-way ring, and the two gears H are simultaneously meshed with the gear A.

7. A stamping die as claimed in claim 1, wherein: the lower surface of the sliding block is provided with a trapezoidal guide block which slides in a trapezoidal guide groove on the upper surface of the fixed seat.

8. A stamping die as claimed in claim 1, wherein: one end of the spiral spring is connected with the outer cylindrical surface of the corresponding rotating ring B, and the other end of the spiral spring is connected with the inner wall of the corresponding ring groove B.

9. A stamping die as claimed in claim 1, wherein: the spring A is a compression spring; one end of the spring A is connected with the end face of the sliding block, and the other end of the spring A is connected with the inner wall of the shell; the spring B is an extension spring; one end of the spring B is connected with the inner wall of the corresponding centrifugal groove, and the other end of the spring B is connected with the corresponding centrifugal block.

10. A stamping die as claimed in claim 6, wherein: the transmission ratio of the gear A to the gear H is less than 1; the transmission ratio of the gear A to the gear F is less than 1.